Screening apparatus



Nov. 26, 1929. F. P. NICKERSON 1,737,383

SCREENING APPARATUS Filed, Feb. 9, 1928 BY 52 0% a 9 A TTORNEYS' Patented Nov. 26, 1929 warren arent errata FRANKLIN P. NICKERSON, OF CLEVELAND, OHIO, ASSIGNOR TO THE W. S. TYLER COM- IPANY, 0F CLEVELAND, OHIO, A CORPORATION OF OHIO SCREENING APPARATUS Application filed February The present invention relates, as indicated, to a screening apparatus, and more particularly to improved means for applying material to be screened to a screening machine. The primary object of the invention is to provide a chute for sand or like fiowable solid material which will deliver a substantially uniform layer of such material over a relatively wide area. To the accomplishment of the foregoing and related ends, said invention, then, consists of the means hereinafter fully described and particularly pointed out in the claim.

The annexed drawing and the following description set forth in detail certain mechanism embodying the invention, such disclosed means constituting, however, but one of various mechanical forms in which the principle of the invention may be used.

In said annexed drawing:

Fig. 1 is a side elevation of a chute of the type contemplated by the present invention in assembled relation with a screening machine; Fig. 2 is a broken front elevation of the same; Fig. 3 is a plan view of the distributor plate; Fig. 4: is a longitudinal section therethrough; and Fig. 5 is an end View thereof. 7

Referring more particularly to the draw ings, the reference numeral 1 indicates a screening machine resting upon a base 2 and provided with an intake hopper 3 in which there is mounted an inclined plate 4: for directing material discharged into said hopper on to a screen 5 mounted within the machine. Mounted above said hopper is a diffuser comprising a casing 6 having an inlet opening 7 at its top and a discharge opening 8 at its bottom, said discharge end entering the hopper 3. The casing 6 is flared outwardly from its top to its bottom as is clearly shown in Fig. 2. Thus the inlet end 7 of the casing is of substantially the width of the discharge mouth of the usual storage hopper (not shown), while the discharge end 8 of the casing has a width substantially equal to the width of the screen 5.

An inclined plate 9 mounted in the intake 9; 1928. Serial No. 253,050.

upper end 10 of a diffuser plate 11 which rests upon the inclined floor of the casing 6. The casing 6 is provided adjacent its upper end and in its front wall with a door 12 hinged to the casing as at 13 and provided with a handle 14 to facilitate manipulation thereof.

The plate 11 is formed as a trapezoidal pyramid, its base being formed with a short side 15 and a much longer side 16 parallel therewith, an angular sides 17 and 18 join-v ing the ends of said sides 15 and 16. The triangular faces 19 and 20 are formed on the sides 15 and 16 respectively'as bases, and the faces 21 and 22 are similarly formed on the sides 17 and 18 as bases, all four of said faces meeting in a common apex 23. The plate is suitably braced by ribs or legs 21 and 25, as indicated in Fig. 4.

It will be readily seen that, through the use of the above described device, material may be discharged from the usual cylindrical pipe of relatively small diameter, and will be fed by said chute on to the screen as a broad sheet of substantially uniform thickness. The cylindrical stream of material will strike the plate 9 and be deflected against the upper edge 15 of the plate 11. Obviously the material will tend, because of the cylindrical shape of the stream to pile up adjacent the center point of said edge 15, and the angles of the pyramid joining the face 19 with the faces 21 and 22 are such as to compensate for this piling tendency, and to cause a substantially uniformly thick sheet of flowable material to slide down toward the base of the plate. The inclination of the faces 21 and 22 tends to spread thestream fanwise, but a certain portion of the material will overflow the corners joining the face 20 with the faces 21 and 22 toprevent an actual partition of the stream. Thus the cylindrical stream of material is spread out into a relatively thin sheet of substantially uniform thickness and of a width corresponding to the width of the screen 5 before its discharge on to said screen.

Other modes of applying the principle of my invention may be employed instead of the one explained, change being made as regards the mechanism herein disclosed, provided the means stated by the following claim or the equivalent of such stated means be employed. 5 I therefore particularly point out and distinctly claim as my invention:

For use with a machine having a wide intake hopper and a feed bin having a relatively small discharge mouth, means for causing the narrow stream of flowab'le material discharged from said mouth to be fanned out to a width substantially equal to the width of said intake hopper, and for depositing substantially "uniform amounts of Y such material across the entire width of the machine, said means comprising a hollow casing adapted to 'receive'such material from said discharge mouth and to discharge the same into said intake h0pper,=said casing having an inclined portion, the floor of said portion being flared outwardly from its top to its bottom, and a plate formed as a trapezoidal pyramid and having its apex directed upwardly vfrom said floor, said plate resting on said 'floor with the shortest side of its base ad'acen't the top of said casing.

igned by me this 6th day of February, 1928.

FRANKLIN P. NICKERSON. i 

